Automatic stoker



sepa. is?, 1932 'Q B UTHE 1,877,410

' AUTOMATIC STOKER Filed Aug. 25, 1928 '7 Sheets-Sheet l Sept. 13, 1932. c. B. LITTLE AUTOMATIC STOKER Filed Aug. 25, 1928 7 Sheets-Sheet 2 ...wmlro LARENCEB,ZITTLE,

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Cdl/wwwa Filed Aug. 25, 1928 7 SheeS-Sheeb 4 C. B. LITTLE Septtr 13, 1932.

AUTOMAT IC STOKER Filed Aug. 25, 1928 7 Sheets-5h66?. 5

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Sept. 13, 1932. C B. L ;TTLE 1,877,413@l AUTOMATIC S TOKER Filed Aug. 25, 1928 7 SheetsSheet 6 Sept. 13, 1932. c. B. LITTLE AUTOMATIC STOKER Filed Aug. 25, 192e 7 Sheets-smet 7 5M ,9. m ma @da HCL ,wm r f C .N m L m ,Cv/J 5 Patented Sept. 13, 1932 fflfJNlran FST-Aras PATENT OFFICE y f .CLARENCE .13. LITTLE, OF DAYTON, OHIO, AssIGNoR 'rol THE BROWNELLV OOMPANSLOF. v Y V,DAL-Yroiv,OHIO, A 'CORPORATION OF YOHILO l ATOMATIO strokenL Application ledAugust i25, V1928. Serial No.` 302,637.

lates to that 1class of automatic stokers in` Vwhich there `is 'means for regulating the .amountfof coal 'fed andthe'draft. i In this invention it is possiblefto regulate the amount of coal Yin'relation tothe draft sothat there ing the `pawl cam andthe damper.

might be a' small feed of coal with a relatively large draft'or'a'large feed of coal with a relafio'tivelv small/draft. After the arrangement l ao 'FlinsV Tito 'has `been'made soastoiadjust the amount of the draft in relation to the coal, the stoker mechanism can be operated atany speed and "the-draft accordingly accommodated.

vIt is apurpose of this invention toprovide 'an automatic stoker in `which theamountof :coal'to be fed may be regulated `Within a definite rangeand the draft may be adjusted so vas Vto `:produce the Vrequired combustion Vto maintain `the boilers at certain steam pressures. Y

For 'the purpose of "illustration there Vis @shown in the accompanying drawings'a pre-V ferred embodimentof'this invention which -is here shownby way of illustration only.

- Figure lisa front elevation'of the furnace 'with astokerfatt'ac'hed thereto.

Figure 2 is a front elevation of the furnace with'the stoker mechanism removed and part of the` furnace in section.` Figure 3 -is Ya viewshowing the fuel Vfeed- "'ing-.device1in pl'an,with the furnacein horizontal section, the mechanism for regulating the `damper being shown; by dotted lines.

Figure 4 is a side elevationof the `furnace with the stoker mechanismattached-thereto,

showing=the vlower part-ofthe furnace in sec- "ti'on.

motoriw'orm and wormgearon'theline 646 =of -fFigure 5, withthe Stoker drive mechanism 1n 4side elevation.

.rotary movement..

Figure 7 is a detail View showing, in plan, the mechanism for adjusting the rapidity'of feed, and the position ofthe damper,

Figure 8 isa detail view, somewhat enlarged,jof-certain parts shown in Figure 7, on

the line 8-8, Figure 7 looking to ythefleft.

Figure 9 showsthefcrank arm for adjust- Referring tothe drawings in detail, 1 designates'the furnacemechanism-.as a whole.` -In :front-of this furnace is located the automatic feed or stoker means which is provided with a coal chute or hopper 2. In "the lower vpart of this chute or hopper is located one `has the ordinary 'motor shaft 4. Tofthis motorshaft is attached a 'worm shaft byany `suitable means, through which the lother 'mechanism is operated. Thestokeroperat-v ing mechanism is enclosed 1in-,a housing "5. The worm shaft which is attached tol the motor shaftlisindicatedrby 6 and meshes with a ,-worm gear indicated byV the 4numeral 7.

VThe wormv gear 7 is carried upon 'a `shaf-tjS which is4 suitably mounted in the housing as indicated inFigure 6.

Y On the inner end of the shaft 8 is a crank ora crank pin 9f'through whichone end -of a'crank link 10 is pivoted, while 'the other end of this link Vl() is pivoted as indicated rby llto-two plate' members 12. These vplate members are pivoted vtb the outerend of worm feed shaftlS.

`Between these plate members 12 there is pivoted a pawl 15 at .the point indicatedby 14, which engages teeth 16 on a ratchet wheel 17. The ratchetwheel 17 `is mounted upon a shaft 13 and has -for its object the-rotation of {the-shaft 18; `This is done bym'eans lof the structure hereinbefore described, consisting ofthe worm, the worm gear, crank, crank y the link,l plate members 12, pawl 15 and the ratchet wheel 17. As the wormgear 7 rotates, it causes the link to move back and forth and rock'theplatermembers l2 which actuate kthe pawl 15 tof-engage the teeth of the ratchet wheel`17 to give it intermittentY For the purpose of holding the ratchet ymounted at 211uponthe shaft 13 a cam mem- Y ber 2() Whichhas on one part thereof a cam surface 22. This cam surface is adapted to ,engagea roller 22 mounted on the pawlY 15.

By adjusting the cam member 2O the time or point at which the pawl engages the ratchet teeth may be determined and thereby the length of the stroke of thepawl .15 as it engages the ratchet teeth may bemade lbnger or shorter. For the ypurpose of adjusting the cam there is pivoted thereto at 23 a'link member 24. To the'other end of Y this link member 24 at the point indicated vby 25 another link 26 is pivoted and isguided in the frame 27. On the otherv end ofthe linkv 26 there is pivoted a stud member 28 which is engaged'by a -slot 29-in the end of an arm 30.-V This arm 30 is rigidly attachedl `to a shaft 31 which'is-supported by the frame by means of-a bracket member 31. Y yExtending fromv one end of the rod -.or

shaft 31 is a crank arm 32 which has'on the outer end thereof a handle 33 in which there y.with grates 54 which are of any convenient form and arrangement.' Thefurnace'is also .provided with ordinary' doors 55. `By means of this apparatus the feedingof the coal from is la plunger 34 having Von the'end thereof a projection adapted to-it in holes hereinafter described. The plunger fits within the handle member and is provided with a spring Y by, means of which the plungeris kept in engagement with the holes luntil operated to remove it therefrom. l Y

Conveniently locatedy at the handle end of 'the crankarm 32 there is an arcuate plate 37 which has a series of holes .'38 adapted to receive the end 'of the plunger to hold it in fixed position and to hold the mechanism hereinafter described in adjustedrelation.l

This handle is used to operate themechanism that controls the position ofthe cam and after :the handle is moved to any desired point indicated by the holes 38,"the plunger is placed within one of these holes, thereby Vholding the cam in a iixedposition until the plunger is released. The damper-means is also controlled by this same handle. Y j For that purpose there is attached to the rod or shaft'31 an arm 39 which has'pivoted l to the outer end thereof at the'end 40 a link y 41. This link is round in shape, especially so at the outer Vend and adapted to slidein the Vhole 42 provided in a stud 43. This flink 41 is heldin position with the stud 43 by kmeans of 'ascrew member 44. 1

mounted at a point indicated by 47 in the draft flue 48. It can be seen by the structure ,5 here described, that the length of the Stroke 'fated by the same yoperation.

of the `pawl 15 can be controlled by the movement of the arm 32 which regulates the camthat engages the roller on the end of the pawL j It will also be noticed that by this same Y movement of the lever j32the damper is opened or closed,or regul'ated'to kadmit any desired` draft. Y

suitably attached tOfOr. Connected in someta waytothe lshaft 13 is afeedworm 49 which hopper mechanism 2.

"is located' in the lowerpart ofthe chute or For the purpose of 'housingthe worm and Y providing mea-ns whereby the fuel may be conducted by the worm, there is provided a housing 50 Which'leads'from the lower part of the chute to the lower part ofthe furnace,`

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as shown in Figure'4." The furnace is indi- Y or hopper through the housing 50v into the. furnace, itis caused'to pile up andv roll over onto the grates, where combustion takes place @L very rapidly. In fact, combustion .takes 'placev on all of the outer surface fof-the coal.

The fire boX of the'furnace"r 53is provided the hopper or chute 4into the furnace may be through the flue leading intofthefurnace may f take placefslowly or rapidly. y

be controlled,fsoithat combustion 'may either By this means intense heat may be pro# duced or' justsuch heat .as isl necessary Vto regulated without disturbing the control vof* the'coal feeding mechanism. By; adjusting the levery 32 both the coal feedingl and vthe damper'mechanism are controlled andl oper- 1 On lthe end of the worm shaft 6, remote from the motor and indicated bythe numeral 48 is a conventional form of blower operated at a uniform rate of-speed to ydeliver air to the furnace. y n

Having thus fully described my invention,

v what I claim as new and desire to protectv by Letters Patent is: f v.

f 1. In a stoker, in combination With'a furat regular intervals including amotor having a worm shaft, a worm gear operatedby the worm shaft,A an eccentric operated by the *wormv gear, apawl operated by the eccentric, a ratchet wheel operated by the'pawl, a worm The rear part 3.5 l

the stud 43 thecontrol ofthe damper may be .j- 1,710,

nace, means Vfor feeding coal to the'furnace "125 conveyor operated by the ratchet wheel, and i a cam associated with the ratchet wheel and pawl to control the length of the feed stroke, means supplying air to the furnace, means to control the delivery of air to the furnace including the aforesaid motor, an air passage to the furnace, a damper in said air passage, an adjustable rock shaft, an adjustable arm and link connection between the shaft and the damper, and an arm and link connection between the shaft and said cam whereby the amount of air delivered to the furnace may be regulated to correspond to the amount of coal fed to the furnace.

2. In a Stoker, in combination with a furnace, meansfor feeding coal to the furnace at regular intervals including a worm conveyer, a ratchet wheel, and pawl. and operating means therefor for actuating the conveyor, a cam associated with the ratchet wheel and pawl to control the length of the feed stroke,

means for .supplying air to the furnace, an 'Y air passage to the furnace, a damper in said air passage, and means for simultaneously actuating said cam and damper including an Vadjustable rock shaft, an arin and link` connection between said shaft and cam, an arm connected with said shaft, a link connected with said arm, and a slidable adjustable connection between .said link and damper comprising an arm on the damper having a rotatable stud having an opening therein to rey ceive said link,'and clamping means for securing the link in various positions of adjustnient in said stud. p

In testimony whereof, I affix my signature.

CLARENCE B. LITTLE. 

